Lock ring drive tool



April 12, 1960 J. ROS/(N 2,932,082

LOCK RING DRIVE TOOL Filed March 5, 1956 FIG. .7

IN VEN TOR.

Joseph Rosdn a-l' ("i This invention relates to impact type tools and more especially to a drive tool for seating a lock ring in a bore on an insert in such bore.

An object of the invention is to provide a simple, practical and inexpensive device of the character described.

Another object of the invention is to provide a more efiicient tool for setting lock rings on inserts in a bore in a body of relatively soft material such as aluminum or cast iron.

A further object of the invention is to provide a novel lock ring setting tool whereby a lock ring may be more effectively set slightly beyond a flush position without damage to the body of the parent material.

Other and more specific objects and advantages will appear and be brought out more fully in the following specification, reference being had to the accompanying drawing wherein:

Figure l is a side view of an embodiment of the invention shown in association with a power actuator.

Figure 2 is a separate view, partly in section, of the tool itself.

Figure 3 is an end view of the tool of Figure 2.

Figure 4 is a partial view showing the tool in operation, and

Figure 5 is an end view of the tool of Figure l as seen with the end disc removed.

Figure 6 is an enlarged partial view in section.

Referring more particularly to the drawing, the number 10 designates a cylindrical body, preferably of steel having a reduced shank 11 to be received in a spiral spring chuck 12 of a power driven impact hammer 13, shank 11 being formed with a prong 14 for detachable engagement with spring chuck 12.

Body 10 has a reduced diameter end 15 and an outer end portion bore 16 which is counterbored at 17, thus forming an annular end face 18. Body 10 has an annular end face 19. An annular member or ring 20, of a material having a degree of elasticity or compressibility which is more readily yieldable than the material of body 10 and the material of parent body 32, is cementitiously or otherwise suitably secured on end portion 15 and end face 19. Annular member or ring 20 is preferably of RM. 10001 nylon or equivalent material that has a moderate degree of elasticity or compressibility.

A rod like guide member 21 is removably positioned in bore 16 and has a reduced inner end portion 22 and an outer reduced end portion 23 which extends beyond the end 15 of body 10. Member 21 has a transverse groove 24 and body 10 has a transverse bore 25 to receive a lock pin 26 for securing member 21 in bore 16. Body 10 is formed with a circumferential groove 27 axially aligned with bore 25 in which is seated a split ring lock spring retainer 28 for retaining pin 26 in bore 25. Guide'member 21 can therefore be easily removed and reversed, or can be replaced by another guide member having a different diameter reduced end portion.

Figure 4 illustrates the manner of use and operation of the invention. An insert 30 of the type shown in my prior Patent No. 2,400,318 is threadedly secured in a bore 31 in a parent body 32 of soft metal such as aluminum or cast iron, the bore 31 being counterbored at 33 to provide a groove surrounding the insert 30. Insert 30 has a serrated flanged upper end 34. An internally and externally serrated lock ring 35 is positioned as shown, so that the internal serrations of the lock ring mesh with the serrations in the flanged upper end 34 of insert 30, and the external serrations overlie the surrounding portion of the parent body 32, and the tool applied with end extension 23 extending intothe bore of the insert, which bore may be threaded if desired. The inner diameter of the outer end portion 15 is greater than the inner diameter of the lock ring 35, and the outer diameter of the outer end portion is less than the outer diameter of said lock ring. The inner diameter of the annular member 20 is less than the outer diameter of the lock ring, and the outer diameter of the annular member is greater than the outer diameter of the lock ring, so that, with the parts in the position shown in Fig. 4, the outer end portion 15 engages the lock ring between the internal and external serrations thereon, and the annular member 20 engagesa portion of the lock ring including the external serrations thereon, and overlies a portion of the surrounding parent body 32.

As the impact tool 13 is actuated annular end 15 of body 10 will drive lock ring 35 downwardly into counterbore 33 to the position shown in Figure 6, with its outer end surface being a predetermined distance, such as .005", below the surface of parent body 32, without significantly distorting the surrounding material of the parent body, due to the special limited compressibility character of the RM. 10001 nylon of which the annular member 20 is made. Annular member 20 will thus be compressed between the annular end face 19 of the tool body and the surface of the parent body except for the annular portion thereof that bears against lock ring 35.

-.The external serrations of lock ring 35 cut into the surrounding parent body 32, thereby securely locking the insert 30 in place. It will be observed that end 18 of extension 15 will be centered on lock ring 35 by extension 23 of guide member 21. This guide member may be removed and replaced with another guide member for use with a differently sized insert by removing lock spring retainer 28 and pin 26.

Although F.M. 10001 nylon is given above as a preferred example of material for annular member 20, the use of other materials will be obvious and their selection will depend upon the following factors: (1) the nature of the material of the parent body 32; (2) the force employed to drive the tool; and (3) the desired extent of countersink of the lock ring below the surface of parent body 32. The recitation of F.M. 10001 nylon, asan example of a preferred material, therefore, is not to be construed as limitative.

I claim:

1. A tool for driving an insert lock ringwithin an annular groove surrounding a' member to be locked within a bore in a parent body, said member having a central guide bore, comprising, in combination: a cylindrical body having an end bore and a reduced-diameter outer end portion of annular form with an annular end face surrounding said end portion and spaced inwardly from the outer end thereof, said outer end portion having an from said outer end portion, and means for replaceably securing said rod-like member in said bore, said annular member being of a material having a moderate degree of elasticity and having a degree of compressibility which is more readily yieldable than the material of the cylindrical body and'the material of the parent body to permit a predetermined countersink of the lock ring below the surface of the parent body when driven by the tool, and having a thickness substantially equal to the length of said outer end portion so that the outer ends of the annular member and the outer end portion are flush, said annular member having an outer diameter that is "greater than the diameter of the lock ring, .Whereby, when the tool is brought into operative position relative to the "lock ring and the member to be locked with the extension of the-rod-like member in the central guide bore of the member to be locked, the outer, end portion engages the lock ring and the annular member engages acircumambient portion of the lock ring and overlies a portion of the surrounding parent body, and whereby compression of the annular member between said annular end face and said parent body acts to limit countersinking of the lock ring to a predetermined depth without significantly distorting the surrounding material of the parent body.

2. A tool for driving an insert lock ring within an annular groove in accordance with claim 1, in which the rod-like member has reduced diameter end portions. 

